That rule alone is like a loophole, they could have been shaving even unique DL counts, and they will say that only 1 IP per day count on earnings. Of course there's no way to catch them(DeposiitFiles) red-handed but for ones that have high traffic for their files, they surely will feel the shaving of DL counts.
Yes, those with high traffic/downloads can more easily notice any variation in DLs, them or also those that knows very well how much downloads a certain file or group files should get, also those used to constant earnings/day, in those cases its very easy to notice variations.
I dont doubt DF and ALL other host shave downloads thou, Im almost sure actually that all cheat, still like I said several pages back, from experience DF counts more downloads, at least more than Turbobit, upoladed, bitshare, to name some of the must used ones at the moment.
I expected worst with the only unique downloads/1 DL/IP/24hours, surprisingly, it was not THAT bad, same for turbobit, but again, it depends, where you post, your users/traffic.
Compared to loved FSC/WUPLOAD...well, thats like a golden era, defunct now. No comparison of course.
Honestly, not many dared try DF when we had the big boys around, but now that circumstances forces you, I would go as far as saying DF could have given better results for DLs than the likes of Fileserve/Uploadstation, FS/US download shaves were BAAAD seriously, but since everyone was using them, heck uploaded.to with its former rates would have been an awesome mirror for FSC, but since no one used current options back then...of course, all this depends on the user/traffic/target etc, I am not saying this would apply to all.